The PetSafe Deluxe Remote Trainers are a lightweight receiver that allows your dog to be trained at home or at the park-up to 100 yards away. 10 levels of correction, plus a tone-only stimulation. Weather resistant hand held transmitter. Lightweight, waterproof receiver. Operates on a common 9-volt battery and Two (2) 3-volt batteries. Available in two sizes, Little Dog Trainer (8-40 lbs) and Big Dog Trainer (over 40 lbs).